
The text describes the classical period as being based on three general concepts: humanism, rationalism, and idealism. Nothing in excess. In other words, restraint and control. These concepts remind me of the classical period in music. Different time period but same concept. For example, listen to this Mozart sonata and see if it doesn't fit the above description:
and compare with The Spear Bearer.
The Hellenistic period on the other hand sought "the individual and the specific." The text, speaking of the Pergamon Frieze says the figures "not only fill the sculptural space, they break out of their architectual boundaries and invade the spectator's space." This parallels the idealism of the romantic period in music exactly. There is much much more passion and emotion, a liberation of the individual spirit. Listen to Chopin's Winter Wind Etude and see what I mean:
and compare with Nike of Samothrace.